CN204462077U - A kind of electromagnetic test system based on Hall sensor array - Google Patents
A kind of electromagnetic test system based on Hall sensor array Download PDFInfo
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- CN204462077U CN204462077U CN201420857770.3U CN201420857770U CN204462077U CN 204462077 U CN204462077 U CN 204462077U CN 201420857770 U CN201420857770 U CN 201420857770U CN 204462077 U CN204462077 U CN 204462077U
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Abstract
The utility model provides a kind of electromagnetic test system based on Hall sensor array, comprise magnetic field generation device and detector for magnetic field, magnetic field generation device comprises the full-bridge inverter providing exchange current, the main control chip be connected with full-bridge inverter, charging inlet, crossed yoke; Detector for magnetic field comprises the Hall sensor array, data acquisition module, data processing module, the data disaply moudle that are connected successively, and Hall sensor array is arranged in the field region of crossed yoke generation.The utility model can overcome magnetic powder inspection magnetic remain with magnetic, carrier fluid waste while, also have that security is high, detection sensitivity is high, the advantage of the wide aspect of sensing range.
Description
Technical field
The utility model relates to a kind of nondestructive detection system, relates in particular to a kind of electromagnetic test system based on Hall sensor array.
Background technology
Magnetic powder inspection is as a kind of nondestructiving detecting means of maturation, at home and abroad every field is all used widely, the ultimate principle of magnetic powder inspection is: the magnetoconductivity of magnetoconductivity much larger than nonferromagnetic material utilizing ferrimagnet, magnetic flux density β after being magnetized according to workpiece=μ H analyzes, through the B root magnetic line of force in the unit area of workpiece, and can not allow that in the unit area of defect area the B root magnetic line of force passes through, in the material just forcing a part of magnetic line of force to be extruded into below defect, other magnetic line of force is had to be forced to effusion surface of the work and is formed leakage field to go out, magnetic by attract by so caused leakage field, and then realize magnetic powder inspection.
From fixed, portable to portable, from automatic, full-automatic to specialized equipment, from unidirectional magnetiztion to multidirectional magnetization, the own seriation of equipment and commercialization.Although the large-scale sniffer Effect on Detecting of external advanced person is good, expensive, be not many times adapted at domestic popularization.And domestic in Magnetic testing technical industry direction backwardness relatively, the magnetic crack detector on market often can only be little to depth of defect, and the single workpiece in direction detects, to some large area, the workpiece sensing DeGrain of depth of defect and direction the unknown.
Cross-magnetizing ratio juris be in Magnetic testing only defective orientation vertical with magnetic line of force direction or there is larger angle time, just can advantageously generate stray field, and then effectively adsorb magnetic and form magnetic trace.Cross-magnetizing method once can check the defect of different orientation simultaneously, ensures that the reliability detected also improves detection efficiency greatly.The portable crossed yoke that domestic and international industrial flaw detection uses or perhaps rotating magnetic field magnaflux are formally based on this principle.Crossed yoke or perhaps rotating magnetic field are made up of two groups of coils, thus need supply two groups of power supplys, and supply signal generally adopts 36V/10A, and frequency of operation fixes the AC signal of 50HZ.When multi-direction magnetization is carried out to workpiece in multiple magnetic field simultaneously, to the vector in the Ying Shige magnetic field, magnetic field of workpiece effect, namely resultant magnetic field is the superposition of each magnetic vector.
In the flaw detection work of reality, the especially on-the-spot Magnetic testing carried out, a lot of occasions, such as: field, high-altitude, internal tank, pressure pipeline on-line checkingi, the alternating current of ~ 220V cannot be sent to or not allow to enter for security consideration.And be ~ the Alternating Current Power Supply of 220V due to what adopt, the position of detection is widely distributed often, each location detection needs the AC power dispensing of ~ 220V to put in place, otherwise cannot detect.Magnetic testing speed is very fast, but the dispensing of power supply needs for a long time, some position, and as high-altitude, internal tank, the dispensing of power supply is also very difficult, leaves ~ AC power of 220V, difficult to move even one step, so greatly reduce work efficiency.The personnel being engaged in Site Detection generally have an intimate knowledge, and the time that magnetic powder inspection detects is often far below the distribution time of power supply.And adopt ~ 220V Alternating Current Power Supply, also comparatively dangerous.
On the other hand, current Magnetic testing observes defect using magnetic as display medium.According to the kind of the magnetic medium applied during magnetization, this detection method is divided into wet method and dry method.Magnetic is suspended in oil, water or other liquid mediums to use and is called that wet method detects.It is in testing process, is uniformly distributed by magnetic flaw detection ink on the surface of the workpiece, utilizes the flowing of carrier fluid and the attraction of stray field to magnetic to demonstrate shape and the size of defect.Special dry magnetic particle follow procedure is adopted to be applied directly on magnetized workpiece when dry method can not adopt wet method to detect also known as dry method under some special occasions, namely the fault location of workpiece demonstrates magnetic trace, and dry method detects and is used for heavy casting and forging blank and large-sized structural parts.The surface smoothness requirements of these two kinds of methods to detection piece is higher, to the technology of examinations personnel and skill requirement higher, and sensing range is little, and speed is slow.And no matter be that dry method or wet method can be attracted to detected workpiece for the magnetic detected surface due to the factor of self remanent magnetism is not easy to be eliminated, the use of workpiece may be affected, the performance that the micro-magnetic trace left over also can affect magnetic powder inspection is formed for the surface of the work that will repeatedly detect.This flaw detection mode uses at every turn and all can consume a certain amount of magnetic and carrier fluid on the other hand, which results in huge waste, and residual magnetic and carrier fluid can pollute.
Utility model content
The purpose of this utility model is to provide a kind of electromagnetic test system based on Hall sensor array, can overcome magnetic powder inspection magnetic remain with magnetic, carrier fluid waste while, also have that security is high, detection sensitivity is high, the advantage of the wide aspect of sensing range.
To achieve these goals, the utility model is achieved through the following technical solutions:
A kind of electromagnetic test system based on Hall sensor array, comprise magnetic field generation device and detector for magnetic field, described magnetic field generation device comprises the full-bridge inverter providing exchange current, the main control chip be connected with full-bridge inverter, charging inlet, crossed yoke; Described detector for magnetic field comprises the Hall sensor array, data acquisition module, data processing module, the data disaply moudle that are connected successively, and Hall sensor array is arranged in the field region of crossed yoke generation.
Described magnetic field generation device also comprises power detecting module, controls button, electric battery, charging inlet is connected to electric battery and full-bridge inverter, electric battery is connected to power detecting module and full-bridge inverter, main control chip is connected to full-bridge inverter, full-bridge inverter is connected to crossed yoke, controls button and is connected to main control chip.
Described Hall sensor array is made up of at least one Hall cells, each Hall cells comprises four Hall elements, four Hall element directions in this unit are towards 8 directions of four that the divide equally plane straight line indications intersected at a point, on the direction of N or S in the magnetic field that crossed yoke is formed, the Hall cells comprising these 8 directions is set.
The plane that 8 directions that described Hall cells points to are formed is vertical with the magnetic direction of crossed yoke.
The alternating current frequency that described full-bridge inverter provides is not more than 50HZ.
The utility model compared with prior art, has the following advantages:
1, the stray field intensity around Hall sensor array measuring sensor is used, to replace using magnetic cladding element to be detected position, in the reduction of the residual detection capability caused of element surface formation when can avoid using magnetic, the waste that magnetic and carrier fluid also can be avoided to cause and pollution.
2, the utility model uses direct supply, then changes alternating current into by full-bridge inverter, overcomes the danger using high-voltage ac power to cause in magnetic powder inspection process, improves security.
3, the alternating current that the utility model frequency of utilizing full-bridge inverter to change is controlled, overcomes alternating current when detecting the defect on surface of the work and nearly surface, can only detect the defect of nearly surperficial 1mm; Overcome simultaneously and depend merely on a kind of frequency and be difficult to reach the deficiency simultaneously detecting surface and buried defect in time that workpiece is once magnetized.
4, the detector for magnetic field utilizing Hall sensor array to form replaces magnetic display result of detection, the electric current that full-bridge inverter produces is without the need to too large and without the need to taking the mode of rotating magnetic field just can magnetize, both test accuracy was remained, add range of application and the detection speed of pick-up unit simultaneously, save again energy and extend battery working time.
Accompanying drawing explanation
Fig. 1 is crossed yoke structural representation.
Fig. 2 is magnetic field generation device hardware block diagram.
Fig. 3 is full-bridge inverter schematic diagram.
Fig. 4 is main control chip schematic diagram.
Fig. 5 is power detecting module principle figure.
Fig. 6 is detector for magnetic field system chart.
Fig. 7 is a Hall cells.
Fig. 8 is a Hall sensor array topological structure.
Fig. 9 is frequency of operation and the relation detecting the degree of depth.
Figure 10 is pulse width modulated wave signal schematic representation.
Figure 11 is 8 direction of magnetization.
Figure 12 is the output current of two groups of yokes in unit period.
Figure 13 is the test block of the magnetic powder inspection degree of depth.
Wherein 1,2,3,4 is Hall element.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
The utility model provides a kind of electromagnetic test system based on Hall sensor array, comprises magnetic field generation device and detector for magnetic field.As shown in Figure 2, magnetic field generation device comprises full-bridge inverter, main control chip, charging inlet, crossed yoke, power detecting module, control button, electric battery, full-bridge inverter is connected with electric battery, main control chip, crossed yoke, charging inlet, power detecting module is connected with main control chip with electric battery, control button to be connected with main control chip, charging inlet is connected with electric battery.Wherein, main control chip is made up of single-chip microcomputer, electric battery is used for powering to power detecting module and full-bridge inverter, or can be also that electric battery and main control chip are powered by the power supply of outside by charging inlet, power detecting module is mainly used to detect supply voltage and provide operating voltage to main control chip, if battery power is not enough, when power detecting module detects the situation of under-voltage, the operating voltage that power detecting module is supplied to main control chip will change, in order to prevent the change of the full-bridge inverter output current be connected with main control chip, the power of main control chip control break full-bridge inverter, the electric current of output is remained unchanged, for guaranteeing that full-bridge inverter produces the electric current meeting the frequency of system requirements.Meanwhile, main control chip also accepts the information from external control button.
The core of magnetic field generation device of the present utility model is full-bridge inverter, direct current for being provided by battery is converted into the controlled alternating current of frequency in the mode of inversion, output in crossed yoke as shown in Figure 1, make crossed yoke produce the magnetic field meeting system requirements.Specifically, full-bridge inverter needs once magnetizing the time, namely unit magnetizes in the cycle, for crossed yoke provides the alternating current of at least two different frequencies, the problem of near surface flaw and buried defect cannot be detected in order to solve single-frequency simultaneously, in embodiment of the present utility model, full-bridge inverter needs two-way.To crossed yoke two groups of coil with electric current, four magnetic poles one group between two, are equivalent to 2 yokes (i.e. crossed yoke), have the sinusoidal alternating current of certain phase differential respectively excitatory, workpiece forms resultant field by two-phase.
When the square-wave signal of use different frequency as shown in Figure 9 detects, time frequency higher (such as about 50HZ), the defect on nearly surface can only be found, along with the raising of frequency, detect the degree of depth more and more shallow, along with the reduction of frequency, detect the degree of depth more and more darker, but when frequency is greater than 50HZ, detect the degree of depth compared with during about 50HZ, not larger change, therefore, the a-c cycle that full-bridge inverter exports controls be not more than the scope of 50HZ.
Fig. 6 is detector for magnetic field of the present utility model, detector for magnetic field is provided with the Hall sensor array detecting magnetic field magnetic field strength, Hall sensor array comprises several Hall cells, magnetic field generation device carries out magnetized to surface of the work while, Hall sensor array in detector for magnetic field detects the magnetic field intensity in specific several direction, its region, the magnetic field strength date that data collecting module collected Hall sensor array exports, data processing module is to the magnetic line of force intensity under magnetic field strength date and the flawless situation of ideal and move towards to contrast, result is shown by data disaply moudle.Wherein, Hall cells as shown in Figure 7, the quantity of Hall cells can set according to the area of actual imaging, can be one, two, three, four or more.Each Hall cells comprises four Hall elements, and four Hall element directions in this unit are 8 directions of four the straight line indications intersected at a point vertically dividing equally plane.The placement of the multiple Hall cells in Hall sensor array can design as required, in embodiments more of the present utility model, can carry out the design of Hall cells by arrangement mode as shown in Figure 8, the Hall element in namely all Hall cells is towards identical 8 directions.In the utility model, the direction of N or S of the rotating magnetic field that crossed yoke is formed, arranges the Hall sensor array at least comprising a Hall cells, for detecting the magnetic line of force by workpiece.In embodiments more of the present utility model, the direction of N and S of the rotating magnetic field that also can be formed at crossed yoke, all arranges the Hall sensor array at least comprising a Hall cells, for detecting the current numerical value of the magnetic line of force.Simultaneously in system of the present utility model, the plane that 8 directions that Hall cells points to are formed is vertical with the magnetic direction of crossed yoke, so that measurement is more accurate.
Carrying out in the embodiment tested in the test block of the magnetic powder inspection degree of depth shown in Figure 13, the full-bridge inverter of magnetic field generation device is two-way, wherein the circuit theory diagrams on a road as shown in Figure 3, main control chip adopts model to be the singlechip chip of ATMEGA48PA, as shown in Figure 4, what power detecting module adopted is circuit theory diagrams as shown in Figure 5 to its circuit theory diagrams.The unit cycle of magnetizing used is 3 seconds, 3 seconds magnetize in the cycle, the full-bridge inverter cycle as shown in fig. 13 that produces is respectively 0.2 second, 0.1 second, 0.05 second, 0.025 second and 0.02 second, namely frequency is respectively the alternating current of 5 frequencies of 5HZ, 10HZ, 20HZ, 40HZ, 50HZ, exports to crossed yoke.8 parts will be divided into the cycle, and use main control chip to control, and make two groups of yokes corresponding two groups of electric currents exported as shown in figure 12 in unit magnetizes the cycle, produce the magnetic field in the direction of eight shown in Figure 11.
Specifically, use crossed yoke as shown in Figure 1, see the polarization current of Figure 12, at first 1/8th intraperiod line circle L1 and L2, L3 and L4 meets No. 1 direction in Figure 12 by the magnetic field that electric current produces, second 1/8th intraperiod line circle L1 and L2 meets No. 2 directions in Figure 12 by the magnetic field that electric current produces, 3rd 1/8th intraperiod line circle L1 and L2, the magnetic field that L3 and L4 produces meets No. 3 directions in Figure 12, produce magnetic field at the 4th 1/8th intraperiod line circle L3 and L4 and meet No. 4 directions in Figure 12, at the 5th 1/8th intraperiod line circle L1 and L2, L3 and L4 meets No. 5 directions in Figure 12 by the magnetic field that electric current produces, 6th 1/8th intraperiod line circle L1 and L2 meet No. 6 directions in Figure 12 by the magnetic field that electric current produces, 7th 1/8th intraperiod line circle L1 and L2, the magnetic field that L3 and L4 produces meets No. 7 directions in Figure 12, produce magnetic field at the 8th 1/8th intraperiod line circle L3 and L4 and meet No. 8 directions in Figure 12, adopt the electric energy can saving 25% in this way.
Hall sensor array needed to detect in each 1/8th cycles simultaneously, the magnetic field intensity in 8 directions as shown in figure 11, the data that data collecting module collected Hall sensor array sends also carry out A/D conversion to data, then the magnetic line of force intensity under data processing module and nondestructive state is transferred to compare, judge whether to there is slight crack, if there is slight crack to estimate the general direction of slight crack, finally show real magnetic field degree of impairment by data disaply moudle in the mode of image.In the process, the frequency that full-bridge inverter produces is not more than 50HZ, power detecting module provides operating voltage for main control chip and detects supply voltage, when there is undervoltage condition in power supply, main control chip is by the power of control break full-bridge inverter, make its output current constant, guarantee that the magnetic field intensity that magnetic field generation device produces remains unchanged.
Claims (5)
1. the electromagnetic test system based on Hall sensor array, it is characterized in that: comprise magnetic field generation device and detector for magnetic field, described magnetic field generation device comprises the full-bridge inverter providing exchange current, the main control chip be connected with full-bridge inverter, charging inlet, crossed yoke; Described detector for magnetic field comprises the Hall sensor array, data acquisition module, data processing module, the data disaply moudle that are connected successively, and Hall sensor array is arranged in the field region of crossed yoke generation.
2. a kind of electromagnetic test system based on Hall sensor array according to claim 1, it is characterized in that: described magnetic field generation device also comprises power detecting module, controls button, electric battery, charging inlet is connected to electric battery and full-bridge inverter, electric battery is connected to power detecting module and full-bridge inverter, main control chip is connected to full-bridge inverter, full-bridge inverter is connected to crossed yoke, controls button and is connected to main control chip.
3. a kind of electromagnetic test system based on Hall sensor array according to claim 1, it is characterized in that: described Hall sensor array is made up of at least one Hall cells, each Hall cells comprises four Hall elements, four Hall element directions in this unit are towards 8 directions of four that the divide equally plane straight line indications intersected at a point, on the direction of N or S in the magnetic field that crossed yoke is formed, the Hall cells comprising these 8 directions is set.
4. the electromagnetic test system based on Hall sensor array according to claim 3, is characterized in that: the plane that 8 directions that described Hall cells points to are formed is vertical with the magnetic direction of crossed yoke.
5. the electromagnetic test system based on Hall sensor array according to claim 1 and 2, is characterized in that: the alternating current frequency that described full-bridge inverter provides is not more than 50HZ.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147215A (en) * | 2020-09-23 | 2020-12-29 | 上海磁海无损检测设备制造有限公司 | Magnetization control method and system, control device and equipment for magnetic powder flaw detection |
| CN112186101A (en) * | 2020-09-29 | 2021-01-05 | 中国科学院半导体研究所 | Method for carrying out weak magnetic field space imaging based on semiconductor two-dimensional electron gas |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147215A (en) * | 2020-09-23 | 2020-12-29 | 上海磁海无损检测设备制造有限公司 | Magnetization control method and system, control device and equipment for magnetic powder flaw detection |
| CN112186101A (en) * | 2020-09-29 | 2021-01-05 | 中国科学院半导体研究所 | Method for carrying out weak magnetic field space imaging based on semiconductor two-dimensional electron gas |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20191230 |
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| CF01 | Termination of patent right due to non-payment of annual fee |